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Does the Play5 play other music sources? Are you selecting Line In in the Sonos app? What cable are you using the connect the turntable to the Play5? Which T1 do you have? Some versions do not have a phono preamp built in.
Note you can make the turntable automatically play to the Five if you go into settings and set Autoplay to On and the Autoplay Room to the Five’s room name.